一到c程序问题（所有分数了）

题目是输入一个0到99999之间的数，1：求出它有几位；2：打印出每一位
<br>3：按逆序打印出各位数字，例如原数为321，应输出123.
<br>整个程序如下，出现了一个问题当输入的数大于40000时就会出现错误，在0到39999之间都正常，请高手指点下。
<br>main()
<br>{ long int num;
<br>  int place,ten_thousand,thousand,huandred,ten,indiv;
<br>  printf("please input the number(0~99999):n");
<br>
<br>  scanf("%ld",&num);
<br>  if(num&gt;9999)place=5;
<br>  else if(num&gt;999)place=4;
<br>  else if(num&gt;99)place=3;
<br>  else if(num&gt;9)place=2;
<br>  else place=1;
<br>  printf("place=%d  n",place);
<br>
<br>
<br>
<br>   ten_thousand=num/10000;
<br>  thousand=(num-ten_thousand*10000)/1000;
<br>  huandred=(num-ten_thousand*10000-thousand*1000)/100;
<br>  ten=(num-ten_thousand*10000-thousand*1000-huandred*100)/10;
<br>  indiv=num-ten_thousand*10000-thousand*1000-huandred*100-ten*10;
<br>
<br>  switch(place)
<br>  {
<br>   case 5:printf("%d,%d,%d,%d,%dn",ten_thousand,thousand,huandred,ten,indiv);
<br>   printf("%d%d%d%d%d",indiv,ten,huandred,thousand,ten_thousand);
<br>   break;
<br>
<br>   case 4:printf("%d,%d,%d,%dn",thousand,huandred,ten,indiv);
<br>   printf("%d%d%d%d",indiv,ten,huandred,thousand);
<br>   break;
<br>   case 3:printf("%d,%d,%dn",huandred,ten,indiv);
<br>   printf("%d%d%d",indiv,ten,huandred);
<br>   break;
<br>   case 2:printf("%d,%dn",ten,indiv);
<br>   printf("%d%d",indiv,ten);
<br>   break;
<br>   case 1:printf("%dn",indiv);
<br>   printf("%d",indiv);
<br>   break;
<br>  }
<br>  
<br>
<br>}

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